Electronic apparatus having antenna device

Abstract

An electronic apparatus having an antenna device. The electronic apparatus includes a housing, a circuit board, an antenna device and a feeding device. The circuit board is placed inside the housing. The antenna device disposed on a surface of the housing transmits and receives a wireless signal. The feeding device has one end electrically connected to the circuit board and the other end electrically connected to the antenna device.

1. An electronic apparatus, comprising:
 a housing comprising an external upper surface and an internal lower surface opposite to the external upper surface; 
 a circuit board placed inside the housing and disposed on the internal lower surface of the housing, the circuit board comprising a ground plane; 
 an antenna device, which is disposed on the external upper surface of the housing and is above the ground plane, for transmitting and receiving a wireless signal; and 
 a feeding device having one end electrically connected to the circuit board, and the other end electrically connected to the antenna device; 
 wherein a distance from the external upper surface on which the antenna device is disposed to the internal lower surface on which the circuit board is disposed is greater than one fourth of a wavelength of the wireless signal so as to reduce interference of the circuit board with the antenna device. 
 
     
     
       2. The electronic apparatus according to  claim 1 , wherein the antenna device and the feeding device are integrally formed. 
     
     
       3. The electronic apparatus according to  claim 1 , wherein the antenna device is bonded to the feeding device. 
     
     
       4. The electronic apparatus according to  claim 1 , wherein the antenna device is made of metal. 
     
     
       5. The electronic apparatus according to  claim 1 , wherein the surface of the antenna device is plated with gold. 
     
     
       6. The electronic apparatus according to  claim 1 , wherein the surface of the antenna device is plated with silver. 
     
     
       7. The electronic apparatus according to  claim 1 , wherein the feeding device is a metal rod. 
     
     
       8. The electronic apparatus according to  claim 1 , wherein the feeding device is a metal wire. 
     
     
       9. The electronic apparatus according to  claim 1 , wherein the antenna device is a circular polarized antenna. 
     
     
       10. The electronic apparatus according to  claim 1 , wherein the antenna device is a linear polarized antenna. 
     
     
       11. The electronic apparatus according to  claim 1 , wherein the electronic apparatus is a mobile electronic product. 
     
     
       12. The electronic apparatus according to  claim 11 , wherein the mobile electronic product is a mobile telephone. 
     
     
       13. The electronic apparatus according to  claim 11 , wherein the mobile electronic product is a mobile disk. 
     
     
       14. The electronic apparatus according to  claim 11 , wherein the mobile electronic product is a MP3 player. 
     
     
       15. The electronic apparatus according to  claim 1 , wherein the housing is a plastic housing whose size is 3.5 cm×2 cm×2 cm. 
     
     
       16. The electronic apparatus according to  claim 1 , wherein the circuit board is a multi-layer circuit board whose size is 3.5 cm×2 cm. 
     
     
       17. The electronic apparatus according to  claim 16 , wherein one layer of the multi-layer circuit board is a ground plane whose size is 3.5 cm×2 cm. 
     
     
       18. The electronic apparatus according to  claim 17 , wherein a distance from the antenna device to the ground plane of the circuit board substantially equals 2 cm.